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/*
* Copyright (c) 2013 IBM Corp.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Seth Hoenig
* Allan Stockdill-Mander
* Mike Robertson
*/
package main
import (
"crypto/tls"
"flag"
"fmt"
//"log"
"os"
"os/signal"
"strconv"
"syscall"
"time"
MQTT "github.com/eclipse/paho.mqtt.golang"
)
func onMessageReceived(client MQTT.Client, message MQTT.Message) {
fmt.Printf("Received message on topic: %s\nMessage: %s\n", message.Topic(), message.Payload())
}
func main() {
//MQTT.DEBUG = log.New(os.Stdout, "", 0)
//MQTT.ERROR = log.New(os.Stdout, "", 0)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
hostname, _ := os.Hostname()
server := flag.String("server", "tcp://127.0.0.1:1883", "The full url of the MQTT server to connect to ex: tcp://127.0.0.1:1883")
topic := flag.String("topic", "#", "Topic to subscribe to")
qos := flag.Int("qos", 0, "The QoS to subscribe to messages at")
clientid := flag.String("clientid", hostname+strconv.Itoa(time.Now().Second()), "A clientid for the connection")
username := flag.String("username", "", "A username to authenticate to the MQTT server")
password := flag.String("password", "", "Password to match username")
flag.Parse()
connOpts := MQTT.NewClientOptions().AddBroker(*server).SetClientID(*clientid).SetCleanSession(true)
if *username != "" {
connOpts.SetUsername(*username)
if *password != "" {
connOpts.SetPassword(*password)
}
}
tlsConfig := &tls.Config{InsecureSkipVerify: true, ClientAuth: tls.NoClientCert}
connOpts.SetTLSConfig(tlsConfig)
connOpts.OnConnect = func(c MQTT.Client) {
if token := c.Subscribe(*topic, byte(*qos), onMessageReceived); token.Wait() && token.Error() != nil {
panic(token.Error())
}
}
client := MQTT.NewClient(connOpts)
if token := client.Connect(); token.Wait() && token.Error() != nil {
panic(token.Error())
} else {
fmt.Printf("Connected to %s\n", *server)
}
<-c
}
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